Fingerprintjs2：一款开源设备指纹采集器

http://www.freebuf.com/sectool/105353.html
https://github.com/Valve/fingerprintjs2

调用方法
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var fingerprint = new Fingerprint().get();
如果你想使用 Canvas FingerPrinting，则如下调用：
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var fingerprint = new Fingerprint({canvas: true}).get();
如果你想使用屏幕分辨率计算指纹，则需如下调用：
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var fingerprint = new Fingerprint({screen_resolution: true}).get();
使用自定义的哈希函数
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var my_hasher = new function(value, seed){ return value.length % seed; };
var fingerprint = new Fingerprint({hasher: my_hasher}).get();
或者直接传递方法：
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var my_hasher = new function(value, seed){ return value.length % seed; };
var fingerprint = new Fingerprint(my_hasher).get();